SiVouplai aider moi c pour se midi  supprimer les parenthèses puis réduire chaque expression:

A = -(a+b)-(a-b)+(-a-b)+(-a+b)

B = -(x+5)-x-2-(-x-4)+(x-1)

C = 3-(a+b)-a-b-3+(3-a-b)
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